05 Odyssey and newer if it's the ex model have 8 seats and can be less than 10k. Sienna also can have 8 seats...
Mr minivan and AandR in brooklyn have decent stuff.
About a year ago, my sister bought an 05 Sienna, 8 seats, fully loaded, leather, sunroof, after market stereo, subwoofer, etc for under 10k, from Motti's in Lakewood. I forgot the mileage, but I'm pretty sure it was under 100k.